Fat link irrelevant clover overlap quark propagator

Abstract

Fat link irrelevant clover (FLIC) overlap fermions are a variant of the standard (Wilson) overlap action, with the FLIC action as the overlap kernel rather than the Wilson action. The structure of the FLIC overlap fermion propagator in momentum space is studied, and a comparison against previous studies of the Wilson overlap propagator in quenched QCD is performed. To explore the scaling properties of the propagator for the two actions, numerical calculations are performed in Landau gauge across three lattices with different lattice spacing a and similar physical volumes. We find that at light quark masses the actions agree in both the infrared and the ultraviolet, but at heavier masses some disagreement in the ultraviolet appears. This is attributed to the two actions having different discretisation errors with the FLIC overlap providing superior performance in this regime. Both actions scale reasonably, but some scaling violations are observed.